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Fatigue Cause No. 8: Hidden UTI. If you've ever had a urinary tract infection (UTI), you're probably familiar with the burning pain and sense of urgency. But the infection does not always announce itself with such obvious symptoms. In some cases, fatigue may be the only sign. A urine test can quickly confirm a UTI.
Symptoms of UTIs. Elderly people with serious urinary tract infection don't exhibit the hallmark sign of fever because their immune system is unable to mount a response to infection due to the effects of aging. In fact, elders often don't exhibit any of the common symptoms â or don't express them to their caregivers. UTIs in the elderly are often mistaken as the early stages of dementia or Alzheimer's, according to NIH, because symptoms include: 1  Confusion, or delirium-like state.  Agitation.